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From 002f410771e49dbfe738a2c31a231b5e0ca97b38 Mon Sep 17 00:00:00 2001
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From: Stefan Hajnoczi <stefanha@redhat.com>
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Date: Tue, 7 Oct 2014 14:06:50 +0200
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Subject: [PATCH 32/43] trace: use unique Red Hat version number in simpletrace
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Message-id: <1412690820-31016-2-git-send-email-stefanha@redhat.com>
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Patchwork-id: 61606
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O-Subject: [RHEL7.1 qemu-kvm PATCH 01/11] trace: use unique Red Hat version number in simpletrace
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Bugzilla: 1088112
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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The simpletrace format has changed upstream several times. RHEL7
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qemu-kvm is currently at version 2 level, but now we need to add the pid
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field. This means we need to bump the version number.
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Upstream version 3 changed the way that trace event IDs are calculated.
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Those tracetool changes are not downstream.
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Avoid colliding with upstream version numbers - just in case binary
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trace files from upstream and RHEL are exchanged. Use a unique part of
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the 64-bit version number namespace (based on Red Hat's PCI vendor ID).
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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scripts/simpletrace.py | 11 ++++++-----
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trace/simple.c | 2 +-
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2 files changed, 7 insertions(+), 6 deletions(-)
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diff --git a/scripts/simpletrace.py b/scripts/simpletrace.py
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index 8bbcb42..3cb2cf0 100755
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--- a/scripts/simpletrace.py
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+++ b/scripts/simpletrace.py
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@@ -18,6 +18,7 @@ from tracetool.backend.simple import is_string
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header_event_id = 0xffffffffffffffff
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header_magic = 0xf2b177cb0aa429b4
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dropped_event_id = 0xfffffffffffffffe
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+red_hat_version = 0x00001af400000000
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log_header_fmt = '=QQQ'
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rec_header_fmt = '=QQII'
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@@ -65,13 +66,13 @@ def read_trace_file(edict, fobj):
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header[0] != header_event_id or \
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header[1] != header_magic:
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raise ValueError('Not a valid trace file!')
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- if header[2] != 0 and \
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- header[2] != 2:
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- raise ValueError('Unknown version of tracelog format!')
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log_version = header[2]
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- if log_version == 0:
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- raise ValueError('Older log format, not supported with this QEMU release!')
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+ if log_version not in [0, 2, 3, red_hat_version]:
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+ raise ValueError('Unknown version of tracelog format!')
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+ if log_version != red_hat_version:
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+ raise ValueError('Log format %d not supported with this QEMU release!'
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+ % log_version)
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while True:
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rec = read_record(edict, fobj)
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diff --git a/trace/simple.c b/trace/simple.c
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index 1e3f691..64e196a 100644
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--- a/trace/simple.c
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+++ b/trace/simple.c
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@@ -27,7 +27,7 @@
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#define HEADER_MAGIC 0xf2b177cb0aa429b4ULL
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/** Trace file version number, bump if format changes */
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-#define HEADER_VERSION 2
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+#define HEADER_VERSION 0x00001af400000000ULL
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/** Records were dropped event ID */
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#define DROPPED_EVENT_ID (~(uint64_t)0 - 1)
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--
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1.8.3.1
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